Year	US Dollars
1960	1.69522
1961	2.34185
1962	2.62127
1963	1.4838
1964	1.94434
1965	2.43977
1966	3.22797
1967	2.41075
1968	2.6137
1969	3.06311
1970	2.55761
1971	3.99808
1972	4.63634
1973	3.99632
1974	6.02901
1975	8.45416
1976	5.24682
1977	5.76237
1978	6.34731
1979	9.67688
1980	10.17653
1981	10.52151
1982	9.67745
1983	12.27676
1984	22.13128
1985	15.01178
1986	12.24778
1987	22.58203
1988	6.1714
1989	8.07925
1990	26.63347
1991	15.97894
1992	10.92693
1993	4.93489
1994	3.35346
1995	5.30122
1996	-22.06964
1997	-11.31055
1998	9.24966
1999	6.52386
2000	2.12027
2001	1.24583
2002	3.70054
2003	4.45928
2004	11.81175
2005	1.12716
2006	9.10469
2007	7.46145
2008	5.65169
2009	4.95868
2010	-0.21381
2011	1.39836
2012	0.61766
2013	-3.7601
2014	0.65084
2015	-0.01931
2016	-1.6437
2017	-0.91475
2018	-1.06391
2019	-0.08932
2020	-0.15633
2021	0.42801